Driven by the cooperation of metal coordination and multiple hydrogen bonds,a squaramide-based bisimidazole ligand forms structurally novel metallogels involving one-dimensional(1D)nanofibrils with linearly and infini...Driven by the cooperation of metal coordination and multiple hydrogen bonds,a squaramide-based bisimidazole ligand forms structurally novel metallogels involving one-dimensional(1D)nanofibrils with linearly and infinitely extended Cl–Cu or Br–Cu bonds wrapped up with organic ligands.The resulting soft material enables us to discriminate bromides from other salts and,of special significance,from other halides both in aqueous solutions and in powder forms by the naked-eye.Raman spectroscopy clearly unravels the discrimination mechanism associated with a key step of anion ligand exchange,which has witnessed the exceptional ability of Raman spectroscopy in the investigation of metallogels.展开更多
Chemically modifying electrode surfaces with redox active molecular complexes is an effective route to fabricating tailored functional materials.Surface modification has generally required the installation of reactive...Chemically modifying electrode surfaces with redox active molecular complexes is an effective route to fabricating tailored functional materials.Surface modification has generally required the installation of reactive functional groups for direct covalent attachment that can present synthetic challenges.An alternative,milder method that utilizes π-interactions to physisorb the molecular complex onto a surface is described herein.Firstly,a gold electrode was modified with pyrene via covalent thiolate bonds.A pyrene-functionalized ferrocene was then physisorbed onto the pyrene-modified gold electrode.X-ray photoelectron spectroscopy,infrared spectroscopy,and cyclic voltammetry were used to demonstrate successful physisorption of the pyrene-functionalized ferrocene onto the pyrene-modified gold surface.Physisorption is attributed to pyrene-pyrene(π)interactions,as the ferrocene compound was not observed after identical treatment of a clean gold electrode surface.Additionally,cyclic voltammetry demonstrates facile electron transfer between the electrode and ferrocene through the non-covalent interactions at the interface.Since this approach of surface modification only requires functionalizing the target molecular complex with the relatively inert pyrene functionality,it broadens the range of experimentally accessible molecular precursors for chemically modified electrodes.展开更多
基金supported by grants from the National NSF of China(no.21432005 and 21321061).
文摘Driven by the cooperation of metal coordination and multiple hydrogen bonds,a squaramide-based bisimidazole ligand forms structurally novel metallogels involving one-dimensional(1D)nanofibrils with linearly and infinitely extended Cl–Cu or Br–Cu bonds wrapped up with organic ligands.The resulting soft material enables us to discriminate bromides from other salts and,of special significance,from other halides both in aqueous solutions and in powder forms by the naked-eye.Raman spectroscopy clearly unravels the discrimination mechanism associated with a key step of anion ligand exchange,which has witnessed the exceptional ability of Raman spectroscopy in the investigation of metallogels.
基金supported by the Hellman Faculty Fellows Fund and the School of Physical Sciences at UC Irvineperformed at the UC Irvine Materials Research Institute(IMRI)using instrumentation funded in part by the National Science Foundation Major Research Instrumentation Program under grant no.CHE-1338173.
文摘Chemically modifying electrode surfaces with redox active molecular complexes is an effective route to fabricating tailored functional materials.Surface modification has generally required the installation of reactive functional groups for direct covalent attachment that can present synthetic challenges.An alternative,milder method that utilizes π-interactions to physisorb the molecular complex onto a surface is described herein.Firstly,a gold electrode was modified with pyrene via covalent thiolate bonds.A pyrene-functionalized ferrocene was then physisorbed onto the pyrene-modified gold electrode.X-ray photoelectron spectroscopy,infrared spectroscopy,and cyclic voltammetry were used to demonstrate successful physisorption of the pyrene-functionalized ferrocene onto the pyrene-modified gold surface.Physisorption is attributed to pyrene-pyrene(π)interactions,as the ferrocene compound was not observed after identical treatment of a clean gold electrode surface.Additionally,cyclic voltammetry demonstrates facile electron transfer between the electrode and ferrocene through the non-covalent interactions at the interface.Since this approach of surface modification only requires functionalizing the target molecular complex with the relatively inert pyrene functionality,it broadens the range of experimentally accessible molecular precursors for chemically modified electrodes.
